When a vegetable oil is treated with hydrogen in the presence of nickel (or palladium) catalyst, it forms a fat. This is an example of :
(a) anodising reaction (b) substitution reaction (c) displacement reaction (d) addition reaction
(d) addition reaction
When a vegetable oil is treated with hydrogen in the presence of nickel or palladium catalyst, an addition reaction takes place and a saturated fat is formed.